Grease gun



M. c. BERSTED GREASE GUN Original Filed Nov. 27. 1920 Patented Mar. 15,1927.

enEA-sr: sure.

Original application filed November 2-7, 1920, Serial at. 42am, Dividedand this a puan n iueu September 3, 1921.

i This -a,pplication relates to improvements in grease guns-and isdivision applica- 6011 No. 426,722, filed November 27, 1920.

The object of this invention is to generally improve the construction ofgreaseguns and to render every operation more satisfactory Specialobjects. of the invention are to provide structure in which the pistoncan'be quickly returned to; the back of hame} whereby much tiiiie issaved in charging gun; to provide a connection for the not-tile cap thatwill notleak; and to provide a grip on the barr l that writ enable theoperator w maintaia his hold an niegrm; In the accompanying drawingsillustrating a selected embodiment er the invention Fig. 1 is'anel'evationof the gun;

Fig. 2 is a longitudinal section of the grease gun. I j

. Fig. 3 is a .e'cti'oh substantially Templar -to '2 showing the partsinposition for return of the: ledgerto initial posinen.

engages the barrel.

4, 5 and 6 ares cuehs on lines l-A 5 -5 angel-6 6. respectively of rig.

Fig. "7 is a detail "elevation.

The body of the gun or pump comprises a barrel 17 ferruled at 18betweenits ends to provide a firm and effective grip. It has been customaryheretofore to knurl the barrel so that it may be firmly gripped andwhile this answers well under some conditions the knurling frequentlybecomes filled with dirt and grease so that it is not effective for thepurpose intended. I have found that the ferruling in or about the mannershown provides a permanent and effective gr1p even when the barrel isgreasy as it is very apt to become around a garage or other shop. Thedischarge end of the barrel is provided with a bevel edge 19 and the cap20 has a bevel seat 21 to receive the bevel edge 19 and form a tightseal. The cap 20 has a flange 22 which. enters the barrel 17 andthreadedly thread 23 at its outer end to receive the connecting tube. Aplunger is carried by a screw stem 24 within the barrel and this plungercomprises an upper washer 25, a lower washer 26 and an interposedleather disk 27 which makes tight engagement with the wall of the barreland prevents the grease from passing above the plunger. The upper washerhas radial ribs 25 for strength and is mounted on the inner end of Thecap has an interior.

serial as. 493,590.

the stem. Below thewasher 25 the stein hole will sea-t in the tapered orbevelled groove. Then the outer washer 26 is .put on a the stern and thelatter is spun over at 'itsinner end .2 to secure the pltutger on thestem. With this construct ion the stem turn ea sll y in and relativelyto the plunger head.

At the upper end of the barrel there isan off-set seat 2'9 of hexagonshape to receive the body of a feed hut the lower "part 30of which ishexagon shape; to interlockingly engage the he'xa en seat 29 and theupperipart 81 of which is reduced in diameterga nd is circular in shapeto engage the circular opening 32 in the end of the barrelabov'e thehexagon seat 29. area the net body has been engaged with thesear a) ashoulders?) be the enter edge or the; nut bodyis een are. upon the outerendlot the barrel to make a close, tight, Two complementary members 34are pivotally mounted at 35 in ears 36 on the under side of the nut bodyand these members project up through recesses 87 in the nut body andabove said body and are shaped and threaded to embrace and 'threadedlyengage the threaded stem 24.. These members have a limited pivotalmovement which enables them to be swung into and out of operativeengagement with the stem. The members are limited in their inwardmovement by shoulders 38 thereon engaging the under side of the nutbody? and they are limited in their outward movement by engagementwiththe walls of the recesses but that there should be a limitedspace'between their adjacent edges.

Th h aded members are e in operative engagement with the stem by a cap39' v threaded members should be slightly enlarged at their upper endsand also that the cap should be provided with an interior groove 41'toaccommodate this enlargement. This prevents accidental disengagement ofthe cap from the. threaded members of the nut, and

consequently prevents accidental disengage mentof the threaded membersof the nut from the stem. A handle 42 is secured to the upper end of thestem by a hub 43 which has a tapered lower end 44 and a slight groove45. When the cap 39 is disengaged from the threaded members 34 of thefeed nut it may be thrust up upon the tapered end of the hub intoengagement with the groove 45 to stay there while the plunger is beingreturned to initial position (Fig. 3)

It will be noted that in the ordinary forward feed of the plunger thecap 39 will hold the threaded members in operative engagement with thescrew stem and this arrangement of the parts will continue until it isdesired to refill thebarrel with grease whereupon the plunger isreturned to initial position without necessitating unscrewing movementof the stem.

The gun may be equipped with any sort of flexible conduit but I preferto use that set forth in my accompanying application, Serial Number498,591, filed September 3, 1921.

I am aware that changes in the form and proportion of parts, and in thedetails of construction of my invention may be made without departingfrom the spirit or sacrificing the advantages thereof, and I reserve theright to make all such changes as fairly fall Within the scope of thefollowing claims.

' I claim:

1. A grease gun comprising a barrel having a round opening in itsupper'end and an angular seat below said opening, and a nut having aangular part to fit said seat and a round part to fit said opening.

2. A grease gun comprising a barrel having a round opening in one endand an angular seat below said opening, a nut having an angular part tofit said seat and a round part to fit said opening, and a shoulder onsaid round part spun over to engage the end of the barrel,

MARTIN C. BERSTED.

